British-Nigerian Anthony Joshua moved a step closer to becoming undisputed heavyweight champion of the world on Saturday after beating New Zealander Joseph Parker on a unanimous points decision in their title unification bout.

The 2012 Olympic champion, taken to 12 rounds for the first time in his professional career after 20 previous knockouts, added Parker’s WBO belt to his own WBA Super, IBF and IBO titles.

The three judges scored it 118-110, 118-110 and 119-109 to Joshua, leaving only Deontay Wilder’s WBC title still to conquer.

“Today I got beaten by a better champion, a bigger man,” he said.

“I’m going to come back stronger. No regrets, take it on the chin. Better man on the day.

“I would love to have another go.”